米制(六角孔尺寸) 英制(六角孔尺寸)
規格說明 :R5、R5.5、R6、R7、R8、R9、R10、R11、R12、R13、R14 (米制)
R3/16、R1/4、R5/16、R7/16、R1/2 (英制)
